Vue实现任意内容展开 / 收起功能组件

Posted 2022-12-09 水香木鱼

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文章目录

简介：这是一篇有关【Vue实现任意内容展开 / 收起功能组件】的文章，博主用最精简的语言去表达给前端读者们。

1、collapse组件

<!--展开/收起 组件-->
<template>
  <section
    class="collapse"
    ref="collapse"
    :style="
      height: containerH + 'px',
      'padding-right': (hideControll ? 0 : 50) + 'px',
    "
  >
    <div class="collapse-content" ref="content">
      <slot></slot>
    </div>
    <span
      v-if="!hideControll"
      v-show="controllVisible"
      class="collapse-controll"
      @click="handleControll"
    >
      <i
        v-show="!hideControllIcon"
        class="collapse-controll-icon"
        :class="isShow ? 'el-icon-arrow-up' : 'el-icon-arrow-down'"
      ></i>
       isShow ? foldText : unfoldText 
    </span>
  </section>
</template>

<script>
export default 
  name: "collapse",

  model: 
    prop: "visible",
    event: "change",
  ,

  props: 
    visible: Boolean,

    // 默认显示的内容高度
    defaultHeight: 
      type: Number,
      default: 100,
    ,

    // 是否隐藏内置控制按钮
    hideControll: Boolean,

    // 是否隐藏内置控制按钮icon
    hideControllIcon: Boolean,

    foldText: 
      type: String,
      default: "收起",
    ,

    unfoldText: 
      type: String,
      default: "展开",
    ,
  ,

  data() 
    return 
      isShow: false,
      controllVisible: true,

      containerH: this.defaultHeight,
      contentH: 0,
      DOMWatcher: null,
    ;
  ,

  watch: 
    visible(v) 
      if (v) 
        this.unfold();
       else 
        this.handleFold();
      
    ,

    isShow(v) 
      this.$emit("change", v);
    ,
  ,

  mounted() 
    this.init();
    this.watch();

    if (this.visible) 
      this.unfold();
    
  ,

  destroyed() 
    this.DOMWatcher.disconnect();
  ,

  methods: 
    init() 
      this.contentH = this.$refs.content.offsetHeight;
      /**
       * 当内容变化的同时也是展开状态的话，那么需要更新容器高度
       * 1. 当最新的内容高度大于默认高度时，则把容器高度更新最新内容高度一致即可
       * 2. 反之，把容器高度设到最小（即默认高度），同时设为收起状态
       */
      if (this.isShow) 
        if (this.contentH > this.defaultHeight) 
          this.containerH = this.contentH;
         else 
          this.containerH = this.defaultHeight;
          this.isShow = false;
        
      
      this.controllVisible = this.contentH > this.defaultHeight; // 控制按钮的显示隐藏
    ,

    watch() 
      this.DOMWatcher = new MutationObserver(() => 
        // 监测到DOM变化，重新计算高度
        this.refresh();
      );
      this.DOMWatcher.observe(this.$refs.content, 
        childList: true,
        attributes: true,
        characterData: true,
        subtree: true,
      );
    ,

    refresh() 
      this.$nextTick(() => 
        this.init();
      );
    ,

    handleControll() 
      let handle = this.isShow ? this.handleFold : this.unfold;
      handle();
    ,

    // 收起
    handleFold() 
      this.containerH = this.defaultHeight;
      this.$nextTick(() => 
        this.isShow = false;
      );
    ,

    // 展开
    unfold() 
      const contentH = this.$refs.content.offsetHeight;
      if (contentH > this.defaultHeight) 
        this.containerH = contentH;
      
      this.$nextTick(() => 
        this.isShow = true;
      );
    ,
  ,
;
</script>

<style scoped>
.collapse 
  width: 100%;
  position: relative;
  overflow: hidden;
  transition: height 0.28s ease-in-out;

.collapse-controll 
  position: absolute;
  bottom: 0px;
  right: 8px;
  font-size: 14px;
  font-weight: 400;
  color: #6abcff;
  cursor: pointer;

.collapse-controll-icon 
  margin-right: 2px;

</style>

2、页面使用

<template>
  <div>
    <!-- 自动适应外层容器宽度 -->
    <div style="width: 130px">
      <collapse :default-height="34">
        <div>详细内容:</div>
        <div>水香木鱼欢迎您~</div>
        <div>自己定义内容~</div>
        <div>页面简洁 美观~~</div>
      </collapse>
    </div>
  </div>
</template>

<script>
import collapse from "@/components/collapse.vue";
export default 
  components:  collapse ,
;
</script>

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